Abstract
The effect of a systematic variation of Nd-422 phase content on magnetic properties of melt textured Nd-123 has been investigated. Precisely estimated microstructural parameters such as volume fraction, morphology of Nd-422 particles, and the interface area between the Nd-422 particles and Nd-123 matrix, are correlated to the measured critical current densities. It is found that in the low field region and at higher temperatures, the interfacial pinning by Nd-422 particles is dominant. An anticlockwise tilt observed in the magnetization hysteresis loops at 77 K has been explained by a critical state model in combination with the standard theory of paramagnetism for Nd 3+ ions with a Brillouin function.
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